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Keywords = gallic and glycyrrhizic acid

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17 pages, 8604 KiB  
Article
Design of Composite Systems Based on Hydrophilic Silica and Organic Acids: Gallic, Glycyrrhizic and Its Salts
by Tetiana Krupska, Qiliang Wei, Jinju Zheng, Weiyou Yang, Alina Holovan, Mykola Borysenko and Volodymyr Turov
J. Compos. Sci. 2025, 9(5), 247; https://doi.org/10.3390/jcs9050247 - 16 May 2025
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Abstract
The process of formation of composite systems based on nanosilica A-300 and biologically active substances (BAS), namely gallic acid (GA), glycyrrhizic acid (GLA), and its salts, was studied using a set of physicochemical methods. It was shown that when BAS are immobilized on [...] Read more.
The process of formation of composite systems based on nanosilica A-300 and biologically active substances (BAS), namely gallic acid (GA), glycyrrhizic acid (GLA), and its salts, was studied using a set of physicochemical methods. It was shown that when BAS are immobilized on the silica surface by the method of joint grinding in a porcelain mortar, they pass into a nanosized X-ray amorphous state. Water adsorbed on the surface of such composite systems is also in a clustered state, and the radius of adsorbed water clusters is in the range of 0.4–50 nm. The chloroform environment has a complex effect on the size of water clusters. In general, there is a tendency for the radius of water clusters to increase when air is replaced by a chloroform environment. However, this does not always lead to a decrease in the interfacial energy. The possibility of the existence of metastable ice in the temperature range up to 287 K, stabilized by the surface of composite systems, was discovered. The amount of such ice can reach 20% of the total water content in the sample. The possibility of using complex viscosity measurements for hydrated silica powders and silica containing immobilized biologically active substances was shown. These measurements allow recording changes in the phase state of complex mixtures during the formation of compact composite forms under the influence of periodic mechanical loading. Full article
(This article belongs to the Special Issue Sustainable Biocomposites, 3rd Edition)
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